Starting-switch for motors



H. J. L. AND L. H. FRANK.

STARTING SWITCH FOR MOTORS. APPLICATION'FILEDSEET. I8, 1916 RENEWED MAR.24, 1920.

abtouuqs IAGUL HT/ON H. J.,,L. AND L. H. FRANK.

STARTING SWITCH FOR MOTORS. APPLICATION FILED SEPT. 18. 1916 RENEWEDMAR. 24, 1920.

Patented May 4, 1920.

2 SHEETSSHEET 2- I 7 Lean 1251 112721 Wag-S 712672 essay UNITED STATESPATENT OFFICE.

HARRY J. L. FRANK AND LEON FRANK, OF DETROIT, MICHIGAN, ASSIGNORS TOMUTUAL ELECTRIC &; MACHINE COMPANY, OF DETROIT, MICHIGAN, A ORPORA-TION' or mrcmeau.

STARTING-SWITCH FOR MOTORS.

Patented May 4, 1920.

Application filed September 18, 1916, Serial No. 120,843. Renewed March24, 1920. Serial No. 368,317.

To all whom it may concern:

Be it known that we, HARRY J. L. FRANK and LEON H. FRANK, both citizensof the United States of America, residing at Detroit, in the County ofWayne and State of 'Michigan, have invented. certain new and 1 usefulImprovements in Starting-Switches time.

for Motors, of which the following is a specification, reference beinghad therein to the accompanying drawings.

The invention relates to starting switches for motors and it is theobject of the invention to obtain an improved construction in which themotor circuits are closed through fuses when the. motor is normallyrunning and closed through circuits around the fuses when the motor isstarting; in

which itis impossible to start the motor switch casing showing the tripmechanism with their contacts;

for the switch;

Fig. 2 is a perspective view of the improved switch with its tripmechanism;

' Fig.3 is a cross-section through the main and auxiliary switch bladesin engagement Fig. 4- is a side elevation of the switch casing showing amodified construction of the trip mechanism.

A is the crank handle for operating the switch. B is a shaft having acrank B therein for engaging the switch blades C, C and C of a knifeswitch. Eachof these blades is composed of two separate members D and E,the former being the main switch blade and arranged centrally, while thelatter is the auxiliary switch blade andis of inverted U-shaped crosssection embracing the blade D. Both blade members D and are pivoted to acommon center F and the corresponding blade members of the severalblades C, C and C are connected by insulator bars G and G, respectively.

The crank B is mechanically connected to the insulator bar G byeye-bolts H and the arrangement is such that in rocking the crank handleA to' close the switch, both into circuit through a bar L which shortcircuits the fuse K. The switch contact to which the separate blademembers are piv-A.

oted is connected to the line contact F while the switch contacts I andI- and J and J through the bar L and fuse K respectively are connectedto the line contacts F Thus, in operation, when the switch is closed theblade members E will first contact with the contacts I and I and closethe shunt circuit about the fuse K so as to relieve the latter from thestarting load and prevent blowing of thefuse. The switch will remain inthis condition as long only as the handle A is manually held down, thespring M secured to the casing A which incloses the switch, engaging thecrank B and tending to open the switch. As soon as the handle A isreleased the spring M Will rock the shaft 13 and its crank B in thereverse direction, thereby opening the circuit closed by the member Eand continuin the circuit through the blade members which are in serieswith the fuse K. Guards R secured to the member E prevent arcing of theelectric current.

Return movement of the shaft B is arrested by a catch member N rotatablymounted thereon, which engages a detent O pivoted upon a side of thecasing A andwhich may be tripped by a handle P depending from the detentO and extending below the casing A. sufficiently to be grasped, a coilspring S secured to-the casing and detent normally maintaining saiddetent in position to engage the catch member. The catch member N isprovided with a projection O for engaging the detent O and withprojections 0 extending into the path of the handle A for engaging thesame,

B will return to its original position and through the medium of thelost motion link age Q the blades'D will be opened from their contactmembers J and J.

In the modified construction of trip mech anism as shown in Fig. l thecatch member N is fixedly mounted upon the rock shaft B and the handle Ais rotatabl mounted thereon. The catch member 2 is cam shaped andprovided with a projection O? for engaging the detent O pivoted on thecasing A and the handle 2 is provided with a lug T on its inner face,the arrangement being such that the lug T engages the catch member inone direction of rotation ofthe handle-to rotate the catch member andthe rock shaft upon which the catch member is fixedly mounted and in theopposite direction of rotation the detent to disengage the same from thecatch member thereby releasing the switch blades. The

spring S normally maintains the detent O in engagement with the catchmember.

' What we claim as our invention is: v

1. A switch, comprising two-part blades, the operation of one of saidblades being dependent upon the other, means for manually actuating saidother blade in onedirection of rotation, yieldable means for actuatingsaid other blade in the reverse direction,

' means for maintaining said dependently operated blade inthe positionadjusted by said other blade in its first mentioned direction ofrotation, means for limiting the movement of said other blade in thereverse dl'. rection, andmeans for actuating said limiting means topermit furthermovement of said other blade in said reverse direction.

2. A switch, comprising two-part blades, the movement of one of saidblades being dependent upon the other blade, a shaft having a crank foroperating said other blade, trip mechanism permitting movement of saidshaft inone'direction to close said other blade and its dependentlymoving blade and limiting movement thereof in the opposite direction,and means for actuating said trip mechanism.

3. In a switch, the combination with sepa- .rate blades, of a rock shaftfor operatin spaced projections in the path of movement of saidactuating means permitting of relative movement thereof, and a separateprojection, a pivoted detent for engaging said separate projection, anda handle for actuating said pivoted detent to trip said catch member.

5. In a switch, two-part blades, one of said blades contacting with andactuatin the other of said blades in one direction 0 movement, a lostmotion connection between said blades for actuating said secondmentioned blade from the first mentioned blade, a rock shaft foroperating said first mentioned blade, and a catch member limiting thereturn movement of said rock shaft to prevent actuating engagement ofsaid first mentioned blade, and said member secured to the other blade,and means for tripping said catch member.

6. A switch, comprising two-part blades, a rock shaft for operating saidblades, trip mechanism permitting movement of said shaft in onedirection to close said blades and limiting movement thereof in theopposite direction to permit the opening of one blade, the otherremaining closed, and means for actuating said trip mechanism.

7. In a switch, the combination with separate blades, of a rock shaftfor operating the same, a handle secured to said rock shaft foractuating the same, a catch member rotatably mounted on said rock shaftadapted to contact with said handle to permit of relative rotation, anda movable detent for engaging said catch member.

8. In a switch, the combination with separate blades, of a rock-shaftfor operating the same, relatively movable catch and handle members uponsaid rock shaft adapted to engage each other, one of said members beinsecured to said rock-shaft, land 'a'detent or engaging said catch mem-9. In a switch, the combination with separate blades, of a rock-shaftfor operating thesame, said rock shaft, one of sa-id members beingsecured thereto, means for engagin and retaining said last mentioned memer in a predetermined position, and means for actuating said lastmentioned member through the other into said predetermined positionrelatively movablemembers upon said other blade, tripmechanism-permitting movement of said operating means in one directionto close said other blade and its dependently moving blade and limitingmovement thereof in the oposite direction, and means for actuating saidtrip mechanism.

11. In a switch, the combination with a line contact of main andauxiliary blades connected to said line contact, a second line contact,main and auxiliary blade contacts insulated from each other and adaptedto be engaged respectively by said main and auxiliary blades, a fuseconnecting said second line contact with said main switch contact, anelectrical connection between saidsecond line contact and said auxiliaryswitch contact, and means for actuating one of said blades, theoperation of said other .blade being dependent upon the actuated blade,

12. A switch, comprising two part blades, the movement of one of saidblades being dependent upon the other, means for actuating said otherblade in one direction of movement, means for actuating said other bladein the reverse direction, means for maintaining said, dependentlyoperated blade in the position adjusted by said other blade in its firstmentioned direction of movement, means for limiting the movement of saidother blade in the reverse direction, means for actuating said limitingmeans to permit further movement of said other blade in said reverse diection, and a connection be tween said blades for moving saiddependently operated blade in said reverse direc tion.

lntestimony whereof we aflix our signatures.

scans-Yo. L. FRANK. LEON FRANK,

